Don't really intend to beat a dead horse but....
First of all BMW put the steering wheel heating button in an awkward place.
Plus I actually realized very recently that the button actually has a led when it is turned on.
So next time while driving if you are not sure if the heating is on, just peek and look at that light. (It is impossible to do it without landing yourself into a very dangerous situation since you will need to turn the steering wheel and bend over to view that LED)
BMW could have avoided that LED and passed on that $0.02 savings to us.